Thank you, John.
I do have the heat sink; it doubles as the mounting bracket for the board.
Now I have it all together, but I'm left with one item: a 470uF 35 volt capacitor. The defective board that I'm replacing had the leads of this capacitor soldered right in between the two flat black chips on each side of the board. (Frankly, it doesn't appear that anything is actually intended to be soldered at these locations.)
Should I solder the capacitor to the new board in the same places? Or, is there a better place to put the capacitor? Or, should I just omit it?